Which M mount body has most precise frame lines?

darkosaric said:

I got myself leica M6 – and I am very disappointed with frame lines 50mm (and also it is not so quiet as M3 from my friend, but I can live with that). I know I can get external viewfinder, but I was wondering maybe bessa or zeiss icon or some other leica is better? Which body will give me most accurate frame lines with my summicron 50mm (focus on infinity)?

Thanks,

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